analytical standard Synonym(s): 3-[(1 E )-2-[(1 R ,4a S ,5 R ,6 R ,8a R )-Decahydro-6-hydroxy-5-(hydroxymethyl)-5,8a-dimethyl-2-methylene-1-naphthalenyl]ethenyl]- 2(5 H )-furanone; ent -(3β,11 E )-3,19-Dihydroxy-8(17),11,13-labdatrien-16,15-olide Empirical Formula:...